Double filter for vacuum cleaners



April 18; 1933. w. LEATHERS DOUBLE FILTER FOR VACUUM CLEANERS Filed Dec. 12

INVENTOR.

Patented Apr. 18, 1933 V U TED ,s'mras PTENT @FFIQE WARD LEATHEBS, HAWOB'I'H, NEW EBSEY, ASSIGNOR 1'0 THE QUADREX COR POBATION, A CORPORATION OF CONNEWDICUT DOUBLE FILTER FOR Application med December 1 2, 1930. Serial No. 501,871

The object of my invention is to produce a simple filter for vacuum-cleaners of high ciliciency for its size and bulk.

In order to accomplish this purpose in the simplest manner I have invented a filter which consists of a double fabric duct surrounding the handle ofthe vacuum-cleaner andhave so devised it that it may be simply made and amembled, and at the same time with the full outside area of both ducts for air filtering purposes.

In order to set forth my invention in such terms that all may understand it, I have prepared the following ification and at 5 tached -drawing of whic Figure I'is a partially sectioned lateral vieiw of a vacuum-cleaner with filter.

duct ter..

Figure He is asectional plan view on the line 2a2a in Fig. I.

Figure III is a detail of the filter cloth.

Figure IV shows the filter applied to 'con- 'ventional cleaners. In Figure I, 1 is a. vacuum-cleaner nozzle made integral with the motor-blower housing 2 and supplied with a liftin roller 3 for lightening t e weight on the oor. The dotted line 4 indicates the motor-housin which is 80 surrounded by a casing 5, for de acting the dirt-laden air upward. The filter 6 made, of any suitable fabric, or other filter material, is disposed about a rigid handle 7 which may be supported at its bottom end by the motor- 88 housing 4, if desired. The filter 6 is made of an upper and a lower duct, the u per duct for the u ward movement of the irt-laden air, and t e lower duct for the downward movement of the dirt-laden air until the dirt, is deposited in a suitable receptacle 8. The outer covering of the upward end of the filter 6 may be provided with a series of gores 9, and the abric itself, thered about the handle 7 at 10 and suitab y attached thereto. Such attachment may ve simply consist of t g, then covering with grl both' sides of the filter are grommets or eyelets, 11, for permitting the exhaust of filtered air from the inner walls of both upper and lower air filter ducts. The lower end of re II is a cross-section of the double the filter by spreading slightly at12',becemes two chambers, completely surrounded by fabric, each of which may be joined in suitable manner to the supporting cross-member (see Figure IV). FigureII shows a cross-section of the filter taken in any typical location and showing the inner structure of the filter itself. Asmgle piece of fabric forms a c lindrical filter sleeve 6. Two other ieces o fabric 12 a nd'13 are 00' joined to the s eeve 6 and extend across its diameter, approximately as indicated. The part 12 is sewn to the part 6 at 14 and 15. The part 13 is sewn to the part 6 at 16 and at 17, where 13 and both sides of 11 maybe joined by a single seam 17. The filter is now divided by the fabric partitionsv 12 and 13 into three chambers, 18 and 19 for dirt-laden air and 20 for clean air. If the filter, as illustrated, is turned inside out through the the chamber 20, the seam at 17 will be on the inside. Before the seam is'made, rows of grommets at 11 are ut in place and if the filter is to be turned, t e finished sides are naturally first placed on the inside. The seams at 14, 15, and 16, may be turned as shown, or the edges may be in the chamber 20, and caught within the grommets. To get them, with 17 inside, it will be necessary to turn the filter twice, namely, first through the chamber 18 so and then through the chamber 20. The handle 7 is shown surrounded by a corrugated screen.22, which maintains an air breathing space about the handle, permitting the use of Y the entire areas of the parts 12 and 13 for filter purposes. v

Figure III shows, in/ the diagram, the upper end of the part 12, (and 13). The seams 14 and 15 join the part 12 to the part 6, but at a reasonable distance from the top, so these seams are discontinued, and the seams 23 and 24 are used to join the part 12 to the part 13. The area shown at 25 is therefore half of a small sleeve which neatly surrounds the handle 7. When the areas 26 and 27 are a metal ferrule. u out awa it is obvious that the chamber 18 is join at the to of the filter to the chamber 19 (compare ig. IIa),in such manner that there can be no other air leakage from the dirt-laden chambers than that permitted in Figure I.

- gravity,

by the filter material itself, for the sleeve 25 is tied underneath the gathered end of 6 at In Figure IV, I have shown my chamber filter applied to a conventional vacuum cleaner where the'dirt-laden air is carried upward from 'themotor-b1ower through the hollow yoke 28 and a tube 29 to a supporting crossmember 30. which supports the handle 7. At 30 reasonably air-tight junctures are made between the duct 29 and the chamber 18, and between the chamber 19 and the dirt receptacle 8. 'llhe dirt receptacle is held in place by any suit able clamp, or latches, easily provided.

It is now evident that the fiow of dirtladenair throughout the first half of the filter process is upward toward the top, and

it is equally evident that the air movement I through the filter at the point where it is reversed from an upward to a downward flow is approximately alf its entrance speed and volume. Since this flow is suficient to carry the dirt into the-duct 19, and since half of-the air filtration is accomplished at such time as the air movement is approximately toward the dirt will be deposited in the receptacle 8. 'It is further evident that the filtered air escaping through the filter parts 12 and 13 will. be discharged through the grommets shown.

Having set forth my inventio'nin terms so clear that all those familiar with these arts may readily understand, I wish it further understood that these principles may be applied in various and deviousforms of de- Sign my invention.

I claim: V r

1. In a vacuum-cleaner, in combination, a motor-blower, a handle with no functional air passage therein, said handle surrounded b tibns in said filter sleeve joined to the sides thereof, dividing it into three chambers with the handle pasing through the middle chamber, the outer chambers communicating at the top of said filter, air-discharge openings along the side of the middle chamber,

and a-dirt receptacle in communication with one of the outer chambers at the lower end thereof.

2. In a vacuum-cleaner, incombination,

55 a motor-blower, a dirt receptacle, a handle with no functional air passage therein,

said handle disposed; between two dirtladen air porous walled chambers in a manner to maintain an air discharge space between them, said dirt-laden air'chambers joined'along their outer sides and communicating at the top, air-discharge ports along said joined sidesand communicating with the handle chamber, and one of said dirt-laden air chambers being in communicadouble 1 without departing from the spirit of a filter sleete, with two porous parti- 

